Star Trace Finally Revealed at 6PM!

In the Korean comments

Listen closely to the ending: one top comment reads, in translation, “The final line is all their voices together—I love it,” while another is pleased to hear the members rather than a machine-generated voice. Another commenter points out Eunho hurriedly joining the greeting after everyone else begins.

What the words mean

마참내 (machamnae) is a playful internet-style deformation of 마침내 (machimnae, “finally”), not a separate word with a different literal meaning. Here it makes the excitement over the long-awaited release sound deliberately comic and exaggerated.